Fairly sure all the vanilla meshes are stored in the Skyrim - Meshes.bsa file. Most games don't leave meshes floating around as loose files, only mods do that and only some mods do that. I'm having a similar issue, personally, of a mod that changes that exact mesh to something hideous - But I can't figure out where the file that changes it is to remove it. EDIT: Found my issue, it was a texture change not a mesh change. "dwestonerubble01.dds"